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Color image processing

  • US 5,896,122 A
  • Filed: 01/22/1992
  • Issued: 04/20/1999
  • Est. Priority Date: 01/23/1991
  • Status: Expired due to Fees
First Claim
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1. A method of performing a colour transformation or colour retouch operation on multibit digital data defining P colour components of image pixels in which N most significant bits (MSBs) of each colour component value address a look-up table (LUT) containing coarse versions of output pixel colour component values, and M least significant bits (LSBs) of each colour component value are used to interpolate fine versions of the output pixel values from the coarse output pixel values, wherein P, N, and M are integers and wherein in a first step, for each colour the 2NP addresses of the LUT are loaded with appropriate coarse output pixel values, and in a second step the input pixel data addresses the LUT to obtain coarse output pixel data which is subsequently interpolated, and wherein the first and second steps are repeated with increasing values of N.

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